<?php
namespace PFT\Tool;

class Tools {
	/**
	 * 递归过滤字符串
	 * @param  [type] $value [description]
	 * @return [type]        [description]
	 */
	public static function deepRemoveXss($value) {
		if (empty($value)) {
        	return $value;
    	} else {
    		if (is_array($value)) {
    			array_map(array('PFT\Tool\Tools', 'deepRemoveXss'), $value);
    		}  else {
    			self::removeXss($value);
    		}
        	return $value;
     	}
	}

	/**
	 * 真正执行过滤的方法
	 * @param  [type] $val [description]
	 * @return [type]      [description]
	 */
	public static function removeXss($val) {
	   $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val);
	   $search = 'abcdefghijklmnopqrstuvwxyz';
	   $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
	   $search .= '1234567890!@#$%^&*()';
	   $search .= '~`";:?+/={}[]-_|\'\\';
	   for ($i = 0; $i < strlen($search); $i++) {
	      $val = preg_replace('/(&#[xX]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ;
	      $val = preg_replace('/(�{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ;
	   }
	   $ra1 = array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
	   $ra2 = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
	   $ra = array_merge($ra1, $ra2);
	   $found = true; // keep replacing as long as the previous round replaced something
	   while ($found == true) {
	      $val_before = $val;
	      for ($i = 0; $i < sizeof($ra); $i++) {
	         $pattern = '/';
	         for ($j = 0; $j < strlen($ra[$i]); $j++) {
	            if ($j > 0) {
	               $pattern .= '(';
	               $pattern .= '(&#[xX]0{0,8}([9ab]);)';
	               $pattern .= '|';
	               $pattern .= '|(�{0,8}([9|10|13]);)';
	               $pattern .= ')*';
	            }
	            $pattern .= $ra[$i][$j];
	         }
	         $pattern .= '/i';
	         $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2); // add in <> to nerf the tag
	         $val = preg_replace($pattern, $replacement, $val); // filter out the hex tags
	         if ($val_before == $val) {
	            $found = false;
	         }
	      }
	   }
	   return $val;
	}
}